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Between 10:00 and 10:30, there is a 0.333 percent chance that the switchboard will field more than 9 calls but fewer than 18 calls.
The area of mathematics known as probability deals with numerical representations of the likelihood that an event will occur or that a statement is true. An event's probability is a number between 0 and 1, where, roughly speaking, 0 denotes the event's impossibility and 1 denotes certainty.
The probability is computed by dividing the total number of possible outcomes by the number of possible ways the event could occur. Probability and odds are two distinct ideas. Odds are calculated by dividing the likelihood of an event by the likelihood that it won't.
Time = 30 min (as 10:00 to 10:30)
Total calls = 9+18 =27
Probability receive more than 9 calls but fewer than 18 calls
p(9 < x > 18) = { 10, 11, 12, 13, 14, 15, 16, 17, 18} = 9 (all possibilities)
Total Probability = (likely event / total outcomes)
p(9 < x > 18) = (9/27)
p(9 < x > 18) = 1/3
p(9 < x > 18) = 0.333
To learn more about probability visit: brainly.com/question/13604758
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